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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153f0de246df4f3e528ee15ce140d243d2bc5de34fa10c6b05de9641e348d44c' 
  AND token = '3AcNtoc1DHU2fmlnJJXt8eHSMRJtqM8+mVrtSQLj/8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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