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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1d5755c036bced5416f90d73ad158872b1662589f03d6c1ea16d17a13467f8' 
  AND token = 'oQAFXVr83Oapfk2Ge1MVgcU0NqXb3o+3Ykbyhew0pV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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