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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3355be4c5a178411b0f39a8a08b5f4d1af3377aef27dc080a0c9b02563cb1dfa' 
  AND token = 'mw0b3BpjGjphunpzksdK5pRcb9k+JLjxMDqiJ/MnoaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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