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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e7cb3838ed19fd6deb9800a22346d5b1dc1f640c826fc52686480ca200a98a' 
  AND token = 'ZsY0dDMOuR5Sb04Wx32UUhSMV/qfZzWK0up2WEBcCn4=' 
  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"
    }
  }
}