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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdfac84632335aa64c5e19ec7c6e734465e9bdd0a3f2a7acc4a49251c8bdac5' 
  AND token = '+/Y4QrnxCO/FjnjCOxG5pN262duLSXEL+KTdWLWjnMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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