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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfc843fc612141008519d74a47fa94a8aa58546033f49ab6025738d2ac1ecaf' 
  AND token = 'QzHRxbgke2XaMEFDid4G6Owbp1TYi14+Ry1t0fQYCxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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