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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2364ef584ddd114fcfda1804382dcab4dc866df57160db3b0b6d0962ddad7781' 
  AND token = 'eF6/x2G/Yc8eCGSsQnmg/ZGLe5tzaeRIjR8PsD91GI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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