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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2f384b3edb33dfa570e17b0526ed8ce76248e11bb8674cbebcc7b9031d6ed7' 
  AND token = 'T2AvkG1LeWGwoPdWwkr+XhaWFA3rMm3BgAcmcKjp4zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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