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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35914c9a917e527abb1a5928b156ae7fd2d7f9c2f0bc0aa1f17a2bc7cc0e7b70' 
  AND token = 'uNKCoDdTGN0Di8CKg0lO5G4ctKfHpRPw72gfLtTvz3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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