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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42008bb99084397d3bd8d26c07c1d9b19bb6e103cc0a1e3435ded3dcb4a896b5' 
  AND token = '3Y7AqhX6XZKBCbxHpfNt/6fXYuYWSAHO4kQ6x5kOJtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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