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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12a1a85ad2668591c5a36dbf4263fdd87e29a6b835bafd6e17cca665ad54562' 
  AND token = 'ZVWDrhWDwBP2yBa8raNnbkAiC3kshEYHl18Z+GA5Qms=' 
  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"
    }
  }
}