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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85850f840f92c25359d889f010295a2efb44c5c7e8af636aebb07ea0b299d57' 
  AND token = 'ozIL950RHpJ05t+MkbCy7/UAnegYaDtAzcPugq5aLpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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