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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1a83aaea1630dbee686da63604a1525ee25e2878d3386ac107a8542eb4041b' 
  AND token = '5YEN7UgG5FuTI1YkOsA+EK6q1WkNxK6lVwECxYbYBf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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