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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43a524a0da6beb2b39ed89491e6522a838936fdf5c5b5401e0f49b5a5df0095' 
  AND token = 'QxB4jrQbxm2L4BcQEasV6ax0fjde/3GBwSV2J1sBjQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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