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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cd552b595755ccb2e53e4184ec9685f614c2dd149be37e0d9a787acac24959' 
  AND token = 'rQ6JbYkA+ckXdUmlS0LNiFJrVJVgW3tPUSRyMx/H2XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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