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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ad87aa10a2c2bd85a472d911a3ab708f862b6c03b3e3262dd8e68d8c1587c8' 
  AND token = 'F+XmtjQgXvWkvw16RBa7IUPeWAa1TW6OVw50Ei9Sf4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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