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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd479b70f8ff30fd9dd0f2fc7a86864969ec03ad9762b942ffa6cc94594709b62' 
  AND token = 'tQyLVi4TuaBDFRKLxqLJukwMMYNm6FAiNPTtoRe1j9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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