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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba83e2ebe1a27b1216b3e73a56db60086f989442a0a476a65f52aa3c167e3cce' 
  AND token = '5TgeELV1AndgkkuJcnEMksQXO753y/RSaRjWLJ/8kUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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