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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2381c1896e4004409a0bcc7f3ca686698ae5e26597d308e0690cd200d5287fde' 
  AND token = '+6Rvk9J+BJyitilSjNSBzTgLDDZPdGKdqglsTSQErDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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