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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f0f9efe8e3ee04758a4227d1c606b189d36aa83fcc4eebf53f5f7cea31861f' 
  AND token = 'X9enNFkGn8nHGFoMTGACTsnx7sCb9UBmRfcZeit8ECw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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