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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2f8c1ee871b4ceeaf56019b220e2c8914e8abb42bd0f0dd2fcd66e29521e0e' 
  AND token = 'ycSLEJW1pPj6NfdzfVSF4SnhBRN5dBMx8t0ePlnongA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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