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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d3ee2d011297fbbc0a874b0eb0b9585da4972fe59bf87a052a68ea202d9924' 
  AND token = 'eCyJKXxeygU+3A/bsEXCnO66l3jjz7MqVrbDslvGgnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}