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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874b9d2babdbe51b2208a55c179182267556df2bfa7a394f5182165ac1522926' 
  AND token = 'u5Jhbmg5ZNDsbrYAwdVD1pijNWBoRd+DwX5C6C2y6L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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