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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f304ff3ab5a54648dcd1795eda8bc2209b1a524b1794a7359843903b93f9d6c' 
  AND token = 'ethHkPra2F+mNW2SX9i7IUsCbtiPY8SOArBDVluCimA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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