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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d2b49118c09008c0c3b3b6755986ec5ef738eb33c98b4955a4c8506ec87640' 
  AND token = 'nlqbwdeBR5oBNfdud3SLOk8IKC4pMu5wakrlCrsB2q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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