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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a934c08288b97c67c37b26ee5bc92514bc63166dcd1b98a01fe229e37a40d4fe' 
  AND token = 'pPngjG+o0faweG2DlSXqpI+3aTBIa9utAkCw7Z42qrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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