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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fc2d58118fd446cc36e38bf85b583417d1c57f20bba27ed822a1484e9ef4db' 
  AND token = 'K1CL83KYI0yA/fQhhBAK/oMY9dIuVC8t/IRLMPqb3vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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