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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e583712ada2b800738c735948dffb8b8a30fa6b415d235d8c6eec538d577628' 
  AND token = 'MRS0J0F+6yC3E2nWY7vb7v1nzrnI5YNRJOyD2xLcBwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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