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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5590b1812c5352389d2c0f5975d0a61ca00ead02e1e38973315c4c407cb297b' 
  AND token = '2WA3ZGueka7eqkBRbtwlldkxkvgN3rWI7tGyrLF8NSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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