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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c33b0b36ed2a4db81c7f223678a13ca0ce858251998da836182551e2b393009' 
  AND token = 'bT3ot1TzqsnhqkSXuMTkWVC1d7YY7D4RxyX2M2yu+00=' 
  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"
    }
  }
}