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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc3dc4650c565cb99aecd00e14a987dd8dc6bc9e277ec5e07e220b2c357fe30' 
  AND token = 'ZzLJWtdkI60YKcsmWxLHwu/dX7Vz3wcC63hvCcPfQOw=' 
  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"
    }
  }
}