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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a9ec8774dc54597e31d20fa6cfa9a722c2ceace08f5a7e27328085b2b8e3fd' 
  AND token = 'fVPAV5cCfSP9MFNBNWAit2dMrn9ejkhTEp7oDxfy9Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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