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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba4e3d1854283e79951091555e0c003b56a3e968cca61ef743875ad6e1ea3a2' 
  AND token = 'mrYjQyAuZekFA2gG6MOI1vfFQrfWGoqwTfO5nkaXuok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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