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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb130edb562636e9541d1ec56ebca861368be63f2e10f7a276ff7a52f3f0c3a' 
  AND token = 'W4FTVSSk9plO7sJ6F+YuhEQ9EuYPT8wGbnP2p63RVHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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